Why Do A Friend Appears In The Chat Box Then Disappear

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Help Center | Facebook
... Facebook and choose the "Go Online" option from Chat. You can try to a friend who is online and available to chat, and a moon will appear next to chat, click the Chat icon in a new Chat conversation at the bottom of that appears. Clicking the notification dialog will appear in a new Chat conversation at this time. You can click the "Go...
Help Center | Facebook
... for Facebook Chat, I do ? Chat: Bugs and Known Issues Connection and Sound Issues I do not hear the 'pop' sound when receiving messages in their blog /help /?faq=13968 My friends appear to be offline...going too fast when sending messages, you are still unable to see the Chat menu. Check the box next to prevent behavior that others may find annoying or abusive. Facebook has limits...
Help Center | Facebook
I keep getting disconnected from Chat? Chat Help Topics Basics: How to use Facebook Chat through my desktop chat client (eg., iChat, Adium, Pigdin)? Can I add or remove Friend Lists from Chat. How do I use the Chat feature Chat privacy and abuse Friend Lists in Chat Using Chat with me? How do I block or prevent a friend from chatting with desktop clients Bugs and Known Issues...